How to make a simple thermometer and what is the method of making a homemade thermometer?

The upstairs is basically correct, but the supplementary instructions are as follows: 1. A small opening should be made in the middle of the eraser cap and an empty ballpoint pen refill should be inserted. 2. After the rubber cap is covered in the small liquid medicine bottle, the connection between the rubber cap and the small liquid medicine bottle and the empty ballpoint pen refill should be sealed with wax.

3. The most important thing is to seal the exposed end of the empty ballpoint pen refill with wax, otherwise the thermometer will be affected by the change of weather pressure and produce errors.

The small liquid medicine bottle is used as a glass bubble for the thermometer.

An empty ballpoint pen refill is used as a glass tube for a thermometer.

The rubber cap is used to seal the mouth at the upper end.

A thin straw is used to add liquid.

Wax blocks are used to seal the interface.

Red ink as the indicated liquid.

A thermometer is used to calibrate the scale.

In the refrigerator, at low temperature (such as 5 degrees) engrave the corresponding scale, between 5 degrees and 80 degrees, divide into 75 uniform parts, and mark the corresponding scale with the corresponding scale.

Materials needed: plastic cups, pigments, thermometers, bottle caps, glass bottles, straws.

1. First of all, prepare the required materials and tools, as shown in the figure below

2. Put cold water and warm water in the two plastic cups respectively (the water temperature should not be high), first put the thermometer into the water of the two plastic cups respectively, and see the changes in the thermometer.

3. Fill an appropriate amount of water into the glass bottle (about 1 3 of the volume of the bottle), add a little pigment to cap the bottle, insert the straw into the bottle, and the straw should be submerged in the water.

4. In the previous step, put the vial device into the cold water cup and observe the change of the water level in the vial straw.

5. When finally taking it out of the warm water cup, if there is no water in the straw, open the cap with the straw and cover it again to let the water overflow the straw.

Remove the nib, squeeze out the red oil in the barrel with a thin wire, prepare a temperature measurement liquid, clean the barrel, and make sure the barrel is clean and translucent.

Pour the temperature measuring liquid into the glass bottle (pay attention to the vial not to be full, reserve a part of the air, the effect will be better, the thermometer will rise faster) Drill the cap, insert the cleaned refill into the cap, and seal it with melt glue, so that the thermometer is ready.

A thermometer is a tool that can accurately judge and measure temperature, and is divided into an analog thermometer and a digital thermometer.

Depending on the purpose of use, a variety of thermometers have been designed and manufactured.

On October 16, 2020, the State Food and Drug Administration issued the Notice of the General Department of the State Food and Drug Administration on Matters Related to the Implementation of the Minamata Convention on Mercury. The "Notice" clearly requires that from January 1, 2026, China will completely ban the production of mercury-containing thermometers and mercury-containing blood pressure monitor products.

Materials: clear plastic bottle, straw, alcohol, red food coloring, small plates, balloons or plasticine, scissors, rubber bands, black markers, ice water, hot water.

1. Pour the alcohol into a plastic bottle until it is half full. Add a few more drops of red food coloring and shake until well combined;

2. Take a balloon and cut off the upper part of it, then put the balloon on the mouth of the bottle, and tie it tightly with a rubber band to fix the mouth of the bottle.

3. Cut a small slit in the middle of the balloon, then insert the straw into the gap, and then gently push the straw into the bottle until the tip of the straw is submerged in the alcohol. Balloons can be replaced with plasticine. Use plasticine, (note the height of the liquid in the straw at this time, and use a black marker pen in the straw before the water comes out.)

Make a notation that shows the temperature of the room where the bottle is located. ）

4. Place the bottle in a bowl of hot water for about five minutes, and then use a black marker pen to make a mark at the water level of the straw;

5. Place the bottle in a bowl of ice water, stand for about five minutes, and then use a black marker pen to make a mark at the water level of the straw;

Find a glass bottle with a liquid such as alcohol or kerosene.

Seal with rubber stopper.

A thin glass tube is then inserted.

Put the glass bottle of the finished device in the ice-water mixture for a while and mark it on a thin glass tube to 0 degrees Celsius.

Then the glass bottle is placed in boiling water for a period of time and then marked on a thin glass tube at 100 degrees Celsius.

Divided into 100 servings, the thermometer is ready.

The above requirements are carried out at one standard atmosphere.

You can also find a standard thermometer as a reference (more practical).

Homemade thermometers are as follows:

1. Fill it in a graduated cylinder with tap water and medical alcohol until it is 1 4 full. If you don't have a graduated cylinder at home, you can also find a transparent container that is as slender as a graduated cylinder. However, it is also possible to use a soda bottle or food can, but it will slightly affect the speed of the thermometer's liquid column change, and the more slender the container, the shorter the time it takes to measure the temperature.

If the container is relatively slender, the liquid column will be sensitive to temperature changes, which is why the thermometers you usually see are very thin.

If there is no medical alcohol at home, tap water can be used, but the alcohol expands faster when heated (which means that the liquid column rises or falls faster), and the water will be slower, and the water will freeze below 0 degrees Celsius, so the thermometer made of water cannot measure the temperature below 0 degrees.

2. Add your favorite food coloring to the liquid column. If you use red, people will think it's a real alcohol thermometer, not just a pipe filled with water that you have made haphazardly.

3. Insert a straw into the container. It is best to use a transparent straw so that you can see the rise and fall of the water column inside. If you wish, you can also put a drop of cooking oil in the straw, because the top of the straw is sealed with oil, and the water does not evaporate easily.

4. Use handmade clay to seal the gap between the top of the container and the straw. If you have a lid (such as soda bottles and food cans), you can poke a hole directly in the lid to let the straw out, of course, the hole should be the right size and try not to leak. The gap between the straw and the lid (or top of the container) is then sealed with handmade clay.

Note that the slightest air leak will make the thermometer inaccurate. It can also be sealed with plasticine, candle oil, or petroleum jelly.

5. Measure the temperature. Put the thermometer aside, and the place where the liquid column stops is the current room temperature. Take the thermometer somewhere else, such as in the sun, in the refrigerator, in the closet, and on the windowsill, and see what happens.

Note that it takes a little time to measure the temperature, especially if you are using a wide-mouth container. In addition, if you move the thermometer from time to time, the liquid column may not have time to change.

6. Observe the rise and fall of the liquid column in the straw. At high temperatures, the liquid expands, and the liquid column in the straw is pressed upwards, just like a real thermometer. And where the temperature is low, the liquid shrinks.

This way, you can see where it's hottest at school or at home, and what time of day it's hottest.

It uses the principle of thermal expansion and cold contraction that we commonly see in our lives, that is, in a normal state, the liquid will expand when heated and shrink when cold. But children should pay attention to the fact that the thermometer we usually use is not made of water, because water will have a reverse expansion phenomenon when it is lower than 4, and the lower the temperature, the larger the volume, so the thermometer we usually see is generally made of mercury or alcohol.

You need to prepare: red ink, water, small bottles, straws, markers, and the specific production method is as follows:

2. Then pour the red ink in the cup into a small bottle.

3. Then insert another straw into the small bottle.

4. Next, put the small bottle and a thermometer into the cup.

5. Then mark the straw according to the scale on the thermometer.

6. Finally, the homemade thermometer is made, as shown in the figure below.

Modou Labs: Teach you to "make your own" thermometer.

Use a glass bottle with a rubber stopper with a larger volume, insert a thin, longer beverage straw into the stopper, fill the bottle with colored water (water + appropriate amount of red ink), and cover it with a rubber stopper with a straw - make the liquid column in the tube shorter.

A very simple thermometer prototype is made.

Place the "thermometer" in a larger container, let the cooler water in the container submerge the vial, place it in the water with a standard thermometer, and mark T1 on the level of the pipette when the thermometer indicates T1.

Then change the water in the container to hot water, repeat the above process, and mark T2.

Divide (t2 - t1) n aliquots at the two marks on the tube, and mark the temperature value of each cell!

How about figuring out the details yourself?

The picture is in the language description!

<>1. Take a refill, cut off the head of the refill with artistic force, clean the residual liquid of the refill, and then pour the colored tea into the small medicine bottle, insert the refill tube, coat the glass glue at the interface, wait until the glass glue is dry, put the small medicine bottle into the steamer, and add water to cover the glass bottle.

2. Boil the water, measure the water temperature with a standard thermometer to 100 degrees Celsius, and then mark it with a marker pen at the water column of the refill of the simple thermometer.

3. Add an appropriate amount of cold water to lower the water temperature, and when the standard temperature is measured at 90 degrees Celsius, mark it at the water column of the refill. And so on, and then down to 80 degrees, 70 degrees, 60 degrees, 50 degrees, 40 degrees, etc., one by one at the corresponding temperature of the refill water column marked with a scale.

4. Cut off the upper part of the mineral water bottle with a utility knife, make it into a small cup and fill it with water (one is that the mouth of the cup and the bottle is easy to operate, and the other is that less water can reduce the freezing time), put the simple thermometer together with the refrigerator freezer for about 30 minutes, and then take out the small cup, the ice water at this time is 0 degrees Celsius, after 10-20 seconds (because the freezer of the refrigerator is above minus 10 degrees, the small medicine bottle needs some time to adjust the temperature back to the temperature of the ice water), and then mark the scale at the water column.

5. Finally, measure the distance between the marks on the water column of the refill, draw it 1:1 on the card, and then match the scale, write the degree of Celsius, and fix the card on both sides of the water column with glass glue.